Analysis Of Operation Characteristics Of The Halbach Array Radial Permanent Magnet Electricdynamic Suspension Device

With people’s living quality and the requirement of travel rising,the number of automobiles is increasing rapidly.The traditional internal combustion engine car has caused excessive energy consumption and high levels of pollution.Therefore,the green environmental protection,high efficiency,low noise,no contact maglev car is expected.This thesis presents a Halbach radial permanent magnet electrodynamic wheel device system which can be applied on the “Maglev Cars” by using permanent magnet electrodynamic levitation technology.The device has a similar structure to that of a radial magnetic bearing,besides the rotor of device is changed to a wheel,and the stator of device is converted to a road on which the vehicle runs.When the wheel has a certain speed,it moves relative to the conductor plate.And then,the eddy current is induced with the conductor plate to achieve static suspension.Based on the simulation study of the system,the device design and parameter indicators are proposed.In addition,the resistance force and the vibration characteristics of the system are analyzed as well.In the end,a principle prototype of the Halbach radial permanent magnet electrodynamic wheel is proposed,and key technical issues of design are discussed.This is the key step to build the permanent magnet electrodynamic wheel wheel system.At first,the paper mainly introduces the advance of electrodynamic technique in abroad and domestic,including the calculating formulas of the levitation and resistance force.The parameters that affect the levitation force and resistance force characteristics of the magnetic wheel are also analyzed.Further,the Maxwell two-dimensional transient module is utilized to calculate the variation of the levitation force and resistance force under different parameters.According to the simulation results,more reasonable parameters are selected to design the radial permanent magnet EDW device.In addition,simulation of the levitation system under different conditions are proposed,based on these parameters.Secondly,by using the rotor dynamics analysis module of ANSYS Workbench to simulate the magnetic wheel-rotor system,the Campbell diagram,the critical speed and the natural frequency at each speed are calculated.The speed at which resonance occurs is evaluated to avoid accident.In the working state,try not to run for a long time under the speed.Meanwhile the mode shapes of the sixth-order mode are obtained through modal analysis.Suggestions are provided for dynamic design of structure and fault diagnosis of equipment.Finally,based on the results of electromagnetic simulation,a new type of radial permanent magnet EDW device was built,and an experimental platform was set up using the test system SCML-01.The static conditions of the magnetic wheel and the conductor plate under different working conditions were established.With analysis of experimental data,the relationship between the force characteristics of Halbach array radial permanent magnet wheel levitation device and the rotation speed,levitation gap,etc.,is revealed.B&K analyzer was used to test the vibration characteristics of the permanent magnet magnetic wheel system at different speeds.Through the comparison between simulation data and experiment data,it is obvious that the simulation calculation is accurate and the design of the experimental platform is reasonable.It provides some reference for the design of permanent magnet electrodynamic wheel.